don't tak "I love you" seriously when someone tell you it very easily. just take it as a joke and give a smile. due to culture difference, quality white guys won't tell you they love you unless they are serious. based on my experience, this guy likes you as a friend, but with benefit, definitely not serious. more important, be self-respect all the time. love is nothing to do with race, all about feeling and chemistry.
a bit more about my own experience. a white guy told me he loved me, I just gave him a smile and took it as a joke. The way he talked to me was like described in a love story :) (Be honesty, I was a bit moved), but I did not take it seriously. latter, occasionaly I found out he said same thing to other girls too. I felt very funny. Just try to tell you most of white guys have much more flirting experience than Chinese girls, We Chinese girls should keep awake at the beginning, be friendly and self-esteem and you will win the one with whom you really see and understand what is love.